Kingston Brass NB1600AL Water Onyx  4 inch Centerset Lavatory Faucet with Brass Pop-up Drain, Black Stainless Steel High quality brass construction Durable washerless cartridge 4-Inch center set 3-hole installation with deck plate Max 1.2 gpm/4.5 LPM water flow rate at 60 psi (ASME standard) Compliant with California energy commission title 20